This 427 c.i. GM LS compatible Pro Series long block is built for power adder applications and is rated at 610 HP and 510 lb-ft of torque. It ships without intake, fuel system or ignition.

BluePrint Engines BPMS4271LS Long Block Features:

• 427 c.i. GM LS compatible engine rated at 610 HP and 510 lb-ft of torque
• Block: BluePrint Engines high strength cast iron (LSX style) block, 6 bolt main, 4.070 in. bore
• Rotating assembly: forged crank, 4.125 in. stroke and forged 6.125 in. rods
• Pistons: Mahle 2618 custom forged
• Cylinder heads: LS3 aluminum cylinder heads
• Camshaft: hydraulic roller, 0.641 intake / 0.641 exhaust lift, 236 intake / 256 exhaust duration @ 0.050 in. 115.5 LSA, three bolt cam
• 11.0:1 compression ratio
• Rear sump oil pan included
• Internally balanced

BluePrint Engines BPMS4271LS Installation Notes:

• Recommended fuel: 91 octane
• Recommended spark plug: CCH9405, gapped at .045 in.
• Recommended flexplate/flywheel: non weighted BPP12654640 - BPPLS1611
• Recommended harmonic balancer: non-weighted